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1、下面代码是在ecshop2.7(utf-8)，blueocean模板下实现的，没有使用这个模板的朋友可根据自己使用的模板对照着修改下即可，基本原理大致相同
2、在IE6,IE7,FIREFOX下测试通过，而且支持四级分类， 
3、方法：将library/category_tree.lbi 替换为下面代码即可 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<script language="javascript">
function expandIt(divId){
var objDiv = document.getElementById(divId);
var spobjDiv=document.getElementById("sp"+divId);
if (objDiv.style.display=="none"){
spobjDiv.src='/images/menu_minus.gif';
objDiv.style.display="";
}else{
spobjDiv.src='/images/menu_plus.gif';
objDiv.style.display="none";
}}
</script>
<div class="area" id="category_tree">
<div class="top"><span></span></div>
<div class="content">
<h1>Categories</h1>
<dl>
<!--{foreach from=$categories item=cat}-->
<dt>{if $cat.cat_id}<img src="/images/menu_minus.gif" id="spcattree{$cat.id}" onClick="expandIt('cattree{$cat.id}');" border=0>{/if}<a href="{$cat.url}">{$cat.name|escape:html}</a></dt>
<dd id="cattree{$cat.id}" style="display:block">
<!--{foreach from=$cat.cat_id item=child}-->
{if $child.cat_id}<p><img src="/images/menu_minus.gif" id="spcattree{$child.id}" onClick="expandIt('cattree{$child.id}');" border=0>{else}<p>{/if}<a href="{$child.url}" onfocus="this.blur()">{$child.name|escape:html}</a></p>
<ul id="cattree{$child.id}" >
<!--{foreach from=$child.cat_id item=childe}-->
<li> {if $childe.cat_id}<img src="/images/menu_minus.gif" id="spcattree{$childe.id}" onClick="expandIt('cattree{$childe.id}');" border=0>{/if}<a href="{$childe.url}" onfocus="this.blur()">{$childe.name|escape:html}</a></li>
{if $childe.cat_id}<li id="cattree{$childe.id}">
<!--{foreach from=$childe.cat_id item=childer}-->
<p> <a href="{$childer.url}" onfocus="this.blur()">{$childer.name|escape:html}</a></p>
<!--{/foreach}-->
</li>{/if}
<!--{/foreach}-->
</ul>
<!--{/foreach}-->
</dd>
<!--{/foreach}-->
</dl>
</div>
<div class="bottom"><span></span></div>
</div> 下面是需要用到两个小图标  
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